{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["vehicle", "astronomical object", "food", "disease"], "input": "Some of these directories only exist on a particular system if certain subsystems , such as the X Window System , are installed ."}
{"vehicle": [], "astronomical object": [], "food": [], "disease": []}